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   1 /*
   2  * acpi_container.c  - ACPI Generic Container Driver
   3  * ($Revision: )
   4  *
   5  * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
   6  * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
   7  * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
   8  * Copyright (C) 2004 Intel Corp.
   9  * Copyright (C) 2004 FUJITSU LIMITED
  10  *
  11  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or (at
  16  *  your option) any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful, but
  19  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  *  General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License along
  24  *  with this program; if not, write to the Free Software Foundation, Inc.,
  25  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  26  *
  27  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  28  */
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/types.h>
  33 #include <linux/acpi.h>
  34 #include <acpi/acpi_bus.h>
  35 #include <acpi/acpi_drivers.h>
  36 #include <acpi/container.h>
  37
  38 #define ACPI_CONTAINER_DEVICE_NAME      "ACPI container device"
  39 #define ACPI_CONTAINER_CLASS            "container"
  40
  41 #define INSTALL_NOTIFY_HANDLER          1
  42 #define UNINSTALL_NOTIFY_HANDLER        2
  43
  44 #define _COMPONENT                      ACPI_CONTAINER_COMPONENT
  45 ACPI_MODULE_NAME("container");
  46
  47 MODULE_AUTHOR("Anil S Keshavamurthy");
  48 MODULE_DESCRIPTION("ACPI container driver");
  49 MODULE_LICENSE("GPL");
  50
  51 static int acpi_container_add(struct acpi_device *device);
  52 static int acpi_container_remove(struct acpi_device *device, int type);
  53
  54 static const struct acpi_device_id container_device_ids[] = {
  55         {"ACPI0004", 0},
  56         {"PNP0A05", 0},
  57         {"PNP0A06", 0},
  58         {"", 0},
  59 };
  60 MODULE_DEVICE_TABLE(acpi, container_device_ids);
  61
  62 static struct acpi_driver acpi_container_driver = {
  63         .name = "container",
  64         .class = ACPI_CONTAINER_CLASS,
  65         .ids = container_device_ids,
  66         .ops = {
  67                 .add = acpi_container_add,
  68                 .remove = acpi_container_remove,
  69                 },
  70 };
  71
  72 /*******************************************************************/
  73
  74 static int is_device_present(acpi_handle handle)
  75 {
  76         acpi_handle temp;
  77         acpi_status status;
  78         unsigned long long sta;
  79
  80
  81         status = acpi_get_handle(handle, "_STA", &temp);
  82         if (ACPI_FAILURE(status))
  83                 return 1;       /* _STA not found, assume device present */
  84
  85         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
  86         if (ACPI_FAILURE(status))
  87                 return 0;       /* Firmware error */
  88
  89         return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
  90 }
  91
  92 /*******************************************************************/
  93 static int acpi_container_add(struct acpi_device *device)
  94 {
  95         struct acpi_container *container;
  96
  97
  98         if (!device) {
  99                 printk(KERN_ERR PREFIX "device is NULL\n");
 100                 return -EINVAL;
 101         }
 102
 103         container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
 104         if (!container)
 105                 return -ENOMEM;
 106
 107         container->handle = device->handle;
 108         strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
 109         strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
 110         device->driver_data = container;
 111
 112         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
 113                           acpi_device_name(device), acpi_device_bid(device)));
 114
 115         return 0;
 116 }
 117
 118 static int acpi_container_remove(struct acpi_device *device, int type)
 119 {
 120         acpi_status status = AE_OK;
 121         struct acpi_container *pc = NULL;
 122
 123         pc = acpi_driver_data(device);
 124         kfree(pc);
 125         return status;
 126 }
 127
 128 static int container_device_add(struct acpi_device **device, acpi_handle handle)
 129 {
 130         acpi_handle phandle;
 131         struct acpi_device *pdev;
 132         int result;
 133
 134
 135         if (acpi_get_parent(handle, &phandle)) {
 136                 return -ENODEV;
 137         }
 138
 139         if (acpi_bus_get_device(phandle, &pdev)) {
 140                 return -ENODEV;
 141         }
 142
 143         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
 144                 return -ENODEV;
 145         }
 146
 147         result = acpi_bus_start(*device);
 148
 149         return result;
 150 }
 151
 152 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 153 {
 154         struct acpi_device *device = NULL;
 155         int result;
 156         int present;
 157         acpi_status status;
 158
 159
 160         present = is_device_present(handle);
 161
 162         switch (type) {
 163         case ACPI_NOTIFY_BUS_CHECK:
 164                 /* Fall through */
 165         case ACPI_NOTIFY_DEVICE_CHECK:
 166                 printk("Container driver received %s event\n",
 167                        (type == ACPI_NOTIFY_BUS_CHECK) ?
 168                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
 169                 status = acpi_bus_get_device(handle, &device);
 170                 if (present) {
 171                         if (ACPI_FAILURE(status) || !device) {
 172                                 result = container_device_add(&device, handle);
 173                                 if (!result)
 174                                         kobject_uevent(&device->dev.kobj,
 175                                                        KOBJ_ONLINE);
 176                                 else
 177                                         printk("Failed to add container\n");
 178                         }
 179                 } else {
 180                         if (ACPI_SUCCESS(status)) {
 181                                 /* device exist and this is a remove request */
 182                                 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 183                         }
 184                 }
 185                 break;
 186         case ACPI_NOTIFY_EJECT_REQUEST:
 187                 if (!acpi_bus_get_device(handle, &device) && device) {
 188                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
 189                 }
 190                 break;
 191         default:
 192                 break;
 193         }
 194         return;
 195 }
 196
 197 static acpi_status
 198 container_walk_namespace_cb(acpi_handle handle,
 199                             u32 lvl, void *context, void **rv)
 200 {
 201         char *hid = NULL;
 202         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 203         struct acpi_device_info *info;
 204         acpi_status status;
 205         int *action = context;
 206
 207
 208         status = acpi_get_object_info(handle, &buffer);
 209         if (ACPI_FAILURE(status) || !buffer.pointer) {
 210                 return AE_OK;
 211         }
 212
 213         info = buffer.pointer;
 214         if (info->valid & ACPI_VALID_HID)
 215                 hid = info->hardware_id.value;
 216
 217         if (hid == NULL) {
 218                 goto end;
 219         }
 220
 221         if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
 222             strcmp(hid, "PNP0A06")) {
 223                 goto end;
 224         }
 225
 226         switch (*action) {
 227         case INSTALL_NOTIFY_HANDLER:
 228                 acpi_install_notify_handler(handle,
 229                                             ACPI_SYSTEM_NOTIFY,
 230                                             container_notify_cb, NULL);
 231                 break;
 232         case UNINSTALL_NOTIFY_HANDLER:
 233                 acpi_remove_notify_handler(handle,
 234                                            ACPI_SYSTEM_NOTIFY,
 235                                            container_notify_cb);
 236                 break;
 237         default:
 238                 break;
 239         }
 240
 241       end:
 242         kfree(buffer.pointer);
 243
 244         return AE_OK;
 245 }
 246
 247 static int __init acpi_container_init(void)
 248 {
 249         int result = 0;
 250         int action = INSTALL_NOTIFY_HANDLER;
 251
 252         result = acpi_bus_register_driver(&acpi_container_driver);
 253         if (result < 0) {
 254                 return (result);
 255         }
 256
 257         /* register notify handler to every container device */
 258         acpi_walk_namespace(ACPI_TYPE_DEVICE,
 259                             ACPI_ROOT_OBJECT,
 260                             ACPI_UINT32_MAX,
 261                             container_walk_namespace_cb, &action, NULL);
 262
 263         return (0);
 264 }
 265
 266 static void __exit acpi_container_exit(void)
 267 {
 268         int action = UNINSTALL_NOTIFY_HANDLER;
 269
 270
 271         acpi_walk_namespace(ACPI_TYPE_DEVICE,
 272                             ACPI_ROOT_OBJECT,
 273                             ACPI_UINT32_MAX,
 274                             container_walk_namespace_cb, &action, NULL);
 275
 276         acpi_bus_unregister_driver(&acpi_container_driver);
 277
 278         return;
 279 }
 280
 281 module_init(acpi_container_init);
 282 module_exit(acpi_container_exit);